Argh, lost a long post... trying to reproduce it...
It's DEFINITELY okay to submerge your bag and take a bath if you have a good seal. Of course don't do this until at least a couple hours after a change as the adhesive needs time to really bond with your skin. My WOCN (Wound, Ostomy, and Continence nurse) recommended I try a bath before I went on vacation to reassure myself that my system would be fine in the pool (which it totally was). Do make sure that you're allowed to take a bath by your surgeon though. Six weeks is probably enough time but it all depends on the state of any incisions/wounds/etc.
If you call the ostomy supply companies directly they will be more than happy to send you free samples of any and all products. The big three here in the states are Hollister, Coloplast, and Convatec. Hollister in particular has a really cute "welcome" kit for new ostomates with a carrying case for a spare change, scissors, mirror, etc. If you're having specific problems or want to try a specific product, tell them and they will help you get what you need. I'm sure your nurses mean very well and they sound super supportive, but if you are leaking this frequently then something MUST change. Leaks are inevitable and we deal with them and get on with our lives, BUT it's the definition of insanity to do the same thing over and over again and expect different results!
dx'ed UC pancolitis 5/12
past meds: asacol hd, VSL#3, apriso, rowasa, xifaxan, 6mp, cortifoam, pentasa, cimzia, canasa, butyrate, flagyl, cipro, prednisone, remicade, methotrexate, cholestyramine, cortenema
current meds: none!
step one: colectomy, end ileo 1/16/13
step two: j-pouch construction, loop ileo 5/1/13
step three: takedown 7/31/13